Hair Dynamics throwing hair all over the place in Blender 2.8
i don't know if you already figured this out, but when the hair is going all over the place, if you want the hair to move together like a head of hair or like a main, you need to set the voxel size high enough, 1.0 is a good start, and then set the hair target hair density to 0.5, and target strength to something like 0.01.  Goal strength i set to 0.3 for cloth and for hair.  That should get you going in the right direction.

Under field weights wind can be an issue, OH and your hair may to heavy at 0.3kg, try 0.08 kg to start, maybe less.